Buggy code:
public class PresentationUtility { static List < Integer > numberAlreadyBeingUsedInGame = new ArrayList < Integer > ( ) ; static Integer randomNumberA = 0 ; public static boolean ArrayHasElement ( String [ ] Array , String Element ) { } public static boolean randomIntegerGenerator ( Integer startNumber , Integer endNumber ) { } public static Integer returnRandomNumber ( Integer startNumber , Integer endNumber ) { } public static void main ( String [ ] args ) { } public static String getPersonalityCardNameById ( Integer personalityCardId ) { } public static String getRandomEventCardNameById ( Integer randomEventCardId ) { } public static String getDistinctCommaSeparatedValues ( String strCommaSeparatedString ) { } public static String getCityAreaCardNameById ( Integer cityAreaCard ) { } public static String GetValidAnswerFromUser ( String strValidAnswersCommaSeparated ) throws IOException { String ans = "" ; if ( ! ( strValidAnswersCommaSeparated . startsWith ( "," ) ) ) { strValidAnswersCommaSeparated = "," + strValidAnswersCommaSeparated ; } if ( ! ( strValidAnswersCommaSeparated . endsWith ( "," ) ) ) { strValidAnswersCommaSeparated = strValidAnswersCommaSeparated + "," ; } BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; while ( true ) { ans = br . readLine ( ) ; <START_BUG> if ( ( ans . equals ( null ) ) || ( ans . equals ( "" ) ) ) { <END_BUG> if ( strValidAnswersCommaSeparated . contains ( ( ( "," + ( ans . trim ( ) ) ) + "," ) ) ) { return ans ; } else { System . out . println ( "Invalid<seq2seq4repair_space>input.<seq2seq4repair_space>Please<seq2seq4repair_space>try<seq2seq4repair_space>again." ) ; } } else { System . out . println ( "Invalid<seq2seq4repair_space>input.<seq2seq4repair_space>Please<seq2seq4repair_space>try<seq2seq4repair_space>again." ) ; } } } public static String getGreenCardNameById ( Integer greenCardId ) { } public static HashMap < Integer , Boolean > initializeAHashmapWithValue ( Integer numberToInitialize ) { } public static ArrayList < Integer > initializeAArrayWithValue ( Integer numberToInitialize ) { } public static Integer nextPlayerTurn ( Integer currentPlayer , Integer numberOfPlayers ) { } public static boolean canMinionBePlacedInAdjacentArea ( Integer currentPlayerId , Integer minionId , Integer currentAreaId , int areaToBePlacedIn ) { } public static String GetAdjacentAreas ( int iAreaID ) { } public static boolean isThisGreenCardAssassinationCard ( int greenCardId ) { } public static boolean isThisGreenCardTroubleMakerCard ( int greenCardId ) { } public static boolean isThisGreenCardPlacingAMinionCard ( int greenCardId ) { } public static boolean isThisGreenCardPlacingABuildingCard ( int greenCardId ) { } public static boolean isThisGreenCardInterruptCard ( int greenCardId ) { } public static boolean isThisGreenCardRandomEventCard ( int greenCardId ) { } public static Integer howMuchMoneyToTakeFromBank ( String greenCardIdStr ) { } public static String getCommaSeparatedGreenCardNames ( String greenCardListCommaSeparated ) { } public String drawAsManyCardAsNeeded ( Game Ankhmorpork , Player currentPlayer ) { } public static String takeOneGreenCardFromDeck ( Game Ankhmorpork ) { } }

Fix:
if ( ( ! ( ans . equals ( null ) ) ) || ( ! ( ans . equals ( "" ) ) ) ) {